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Cheeseman JM, Hanson JB. Mathematical analysis of the dependence of cell potential on external potassium in corn roots. Plant Physiol. 1979;63(1):1-4doi: 10.1104/pp.63.1.1.
Cheeseman, J. M., & Hanson, J. B. (1979). Mathematical analysis of the dependence of cell potential on external potassium in corn roots. Plant physiology, 63(1), 1-4. https://doi.org/10.1104/pp.63.1.1
Cheeseman, J M, and Hanson, J B. "Mathematical analysis of the dependence of cell potential on external potassium in corn roots." Plant physiology vol. 63,1 (1979): 1-4. doi: https://doi.org/10.1104/pp.63.1.1
Cheeseman JM, Hanson JB. Mathematical analysis of the dependence of cell potential on external potassium in corn roots. Plant Physiol. 1979 Jan;63(1):1-4. doi: 10.1104/pp.63.1.1. PMID: 16660655; PMCID: PMC542754.
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Plant Physiol. 1979 Jan;63(1):1-4. doi: 10.1104/pp.63.1.1.

Mathematical analysis of the dependence of cell potential on external potassium in corn roots.

Plant physiology

J M Cheeseman, J B Hanson

Affiliations

  1. Department of Botany, University of Illinois, Urbana, Illinois 61801.

PMID: 16660655 PMCID: PMC542754 DOI: 10.1104/pp.63.1.1

Abstract

The K(+) dependence of normal (psi) and diffusion (psi(D)) potentials in corn roots [Zea mays L., hybrid (A619 x Oh43) x A632] was determined experimentally and analyzed with respect to the parameter xi [defined as exp (F psi/RT)]. In the presence of 10 micromolar carbonyl cyanide p-trifluoromethoxyphenylhydrazone (FCCP), psi behaved as expected of a diffusion potential. Based upon the assumptions (a) that FCCP did not change any term of the Goldman-Hodgkin-Katz equation, and (b) that total potential was functionally the algebraic sum of psi(D) and psi(P) (the deviation from psi(D) due to an electrogenic system), psi(P) was found to be a complex function of external potassium and to have a minimum value of 0.69 millimolar K ion activity outside the cell. Analysis of psi allowed us to develop an equation which predicts a complicated K(+) dependence of psi such as that found by Mertz and Higinbotham (Membrane Transport in Plants and Plant Organelles. Springer-Verlag 1974).

References

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